<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS-Grid布局</title>
  <style>
    * {margin: 0; padding:0; box-sizing: border-box;}
    span {font-size: 2em;}

    #container {
      display: grid;
      /*
      容器指定了网格布局以后，接着就要划分行和列。grid-template-columns属性定义每一列的列宽，grid-template-rows属性定义每一行的行高。
      */
      grid-template-columns: 50px 50px 50px;
      grid-template-rows: auto;
      row-gap: 20px;
      column-gap: 20px;
    }
    .item {
      font-size: 2em;
      text-align: center;
      border: 1px solid #e5e4e9;
    }
    .item-1 {
      background-color: #ef342a;
    }

    .item-2 {
      background-color: #f68f26;
    }

    .item-3 {
      background-color: #4ba946;
    }

    .item-4 {
      background-color: #0376c2;
    }

    .item-5 {
      background-color: #c077af;
    }

    .item-6 {
      background-color: #f8d29d;
    }

    .item-7 {
      background-color: #b5a87f;
    }

    .item-8 {
      background-color: #d0e4a9;
    }

    .item-9 {
      background-color: #4dc7ec;
    }
  </style>
</head>
<body>
  <!-- https://www.ruanyifeng.com/blog/2019/03/grid-layout-tutorial.html -->
  <span>Foo</span>
  <div id="container">
    <div class="item item-1">1</div>
    <div class="item item-2">2</div>
    <div class="item item-3">3</div>
    <div class="item item-4">4</div>
    <div class="item item-5">5</div>
    <div class="item item-6">6</div>
    <div class="item item-7">7</div>
    <div class="item item-8">8</div>
    <div class="item item-9">9</div>
  </div>
  <span>bar</span>
</body>
</html>